Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ĕpĭthălămĭum, ii, n., = ἐπιθαλάμιον, a nuptial song, epithalamium, Treb. Poll. Gallien. 11. Quintilian calls the wellknown Carmen nuptiale of Catullus (62) Epithalamium, Quint. 9, 3, 16.